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Use APInt::tcExtract. It's cleaner, and works :)

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@42746 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Neil Booth 2007-10-08 14:39:42 +00:00
parent 68e53ad6cb
commit 5477f8593d
1 changed files with 14 additions and 19 deletions
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33
lib/Support/APFloat.cpp
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@ -1556,32 +1556,27 @@ APFloat::convertFromUnsignedParts(const integerPart *src,
unsigned int srcCount, unsigned int srcCount,
roundingMode rounding_mode) roundingMode rounding_mode)
{ {
unsigned int dstCount; unsigned int omsb, precision, dstCount;
lostFraction lost_fraction;
integerPart *dst; integerPart *dst;
lostFraction lost_fraction;
category = fcNormal; category = fcNormal;
exponent = semantics->precision - 1; omsb = APInt::tcMSB(src, srcCount) + 1;
dst = significandParts(); dst = significandParts();
dstCount = partCount(); dstCount = partCount();
precision = semantics->precision;
/* We need to capture the non-zero most significant parts. */ /* We want the most significant PRECISON bits of SRC. There may not
while (srcCount > dstCount && src[srcCount - 1] == 0) be that many; extract what we can. */
srcCount--; if (precision <= omsb) {
exponent = omsb - 1;
/* Copy the bit image of as many parts as we can. If we are wider,
zero-out remaining parts. */
if (dstCount >= srcCount) {
APInt::tcAssign(dst, src, srcCount);
while (srcCount < dstCount)
dst[srcCount++] = 0;
lost_fraction = lfExactlyZero;
} else {
exponent += (srcCount - dstCount) * integerPartWidth;
APInt::tcAssign(dst, src + (srcCount - dstCount), dstCount);
lost_fraction = lostFractionThroughTruncation(src, srcCount, lost_fraction = lostFractionThroughTruncation(src, srcCount,
dstCount * integerPartWidth); omsb - precision);
APInt::tcExtract(dst, dstCount, src, precision, omsb - precision);
} else {
exponent = precision - 1;
lost_fraction = lfExactlyZero;
APInt::tcExtract(dst, dstCount, src, omsb, 0);
} }
return normalize(rounding_mode, lost_fraction); return normalize(rounding_mode, lost_fraction);